1/* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License, version 2, as 4 * published by the Free Software Foundation. 5 * 6 * This program is distributed in the hope that it will be useful, 7 * but WITHOUT ANY WARRANTY; without even the implied warranty of 8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 9 * GNU General Public License for more details. 10 * 11 * You should have received a copy of the GNU General Public License 12 * along with this program; if not, write to the Free Software 13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 14 * 15 * Copyright SUSE Linux Products GmbH 2009 16 * 17 * Authors: Alexander Graf <agraf@suse.de> 18 */ 19 20#include <asm/ppc_asm.h> 21#include <asm/kvm_asm.h> 22#include <asm/reg.h> 23#include <asm/page.h> 24#include <asm/asm-offsets.h> 25#include <asm/exception-64s.h> 26 27#if defined(CONFIG_PPC_BOOK3S_64) 28 29#define ULONG_SIZE 8 30#define FUNC(name) GLUE(.,name) 31 32#elif defined(CONFIG_PPC_BOOK3S_32) 33 34#define ULONG_SIZE 4 35#define FUNC(name) name 36 37#endif /* CONFIG_PPC_BOOK3S_XX */ 38 39 40#define VCPU_GPR(n) (VCPU_GPRS + (n * ULONG_SIZE)) 41#define VCPU_LOAD_NVGPRS(vcpu) \ 42 PPC_LL r14, VCPU_GPR(r14)(vcpu); \ 43 PPC_LL r15, VCPU_GPR(r15)(vcpu); \ 44 PPC_LL r16, VCPU_GPR(r16)(vcpu); \ 45 PPC_LL r17, VCPU_GPR(r17)(vcpu); \ 46 PPC_LL r18, VCPU_GPR(r18)(vcpu); \ 47 PPC_LL r19, VCPU_GPR(r19)(vcpu); \ 48 PPC_LL r20, VCPU_GPR(r20)(vcpu); \ 49 PPC_LL r21, VCPU_GPR(r21)(vcpu); \ 50 PPC_LL r22, VCPU_GPR(r22)(vcpu); \ 51 PPC_LL r23, VCPU_GPR(r23)(vcpu); \ 52 PPC_LL r24, VCPU_GPR(r24)(vcpu); \ 53 PPC_LL r25, VCPU_GPR(r25)(vcpu); \ 54 PPC_LL r26, VCPU_GPR(r26)(vcpu); \ 55 PPC_LL r27, VCPU_GPR(r27)(vcpu); \ 56 PPC_LL r28, VCPU_GPR(r28)(vcpu); \ 57 PPC_LL r29, VCPU_GPR(r29)(vcpu); \ 58 PPC_LL r30, VCPU_GPR(r30)(vcpu); \ 59 PPC_LL r31, VCPU_GPR(r31)(vcpu); \ 60 61/***************************************************************************** 62 * * 63 * Guest entry / exit code that is in kernel module memory (highmem) * 64 * * 65 ****************************************************************************/ 66 67/* Registers: 68 * r3: kvm_run pointer 69 * r4: vcpu pointer 70 */ 71_GLOBAL(__kvmppc_vcpu_run) 72 73kvm_start_entry: 74 /* Write correct stack frame */ 75 mflr r0 76 PPC_STL r0,PPC_LR_STKOFF(r1) 77 78 /* Save host state to the stack */ 79 PPC_STLU r1, -SWITCH_FRAME_SIZE(r1) 80 81 /* Save r3 (kvm_run) and r4 (vcpu) */ 82 SAVE_2GPRS(3, r1) 83 84 /* Save non-volatile registers (r14 - r31) */ 85 SAVE_NVGPRS(r1) 86 87 /* Save LR */ 88 PPC_STL r0, _LINK(r1) 89 90 /* Load non-volatile guest state from the vcpu */ 91 VCPU_LOAD_NVGPRS(r4) 92 93kvm_start_lightweight: 94 95#ifdef CONFIG_PPC_BOOK3S_64 96 PPC_LL r3, VCPU_HFLAGS(r4) 97 rldicl r3, r3, 0, 63 /* r3 &= 1 */ 98 stb r3, HSTATE_RESTORE_HID5(r13) 99#endif /* CONFIG_PPC_BOOK3S_64 */ 100 101 PPC_LL r4, VCPU_SHADOW_MSR(r4) /* get shadow_msr */ 102 103 /* Jump to segment patching handler and into our guest */ 104 bl FUNC(kvmppc_entry_trampoline) 105 nop 106 107/* 108 * This is the handler in module memory. It gets jumped at from the 109 * lowmem trampoline code, so it's basically the guest exit code. 110 * 111 */ 112 113.global kvmppc_handler_highmem 114kvmppc_handler_highmem: 115 116 /* 117 * Register usage at this point: 118 * 119 * R1 = host R1 120 * R2 = host R2 121 * R12 = exit handler id 122 * R13 = PACA 123 * SVCPU.* = guest * 124 * 125 */ 126 127 /* R7 = vcpu */ 128 PPC_LL r7, GPR4(r1) 129 130 PPC_STL r14, VCPU_GPR(r14)(r7) 131 PPC_STL r15, VCPU_GPR(r15)(r7) 132 PPC_STL r16, VCPU_GPR(r16)(r7) 133 PPC_STL r17, VCPU_GPR(r17)(r7) 134 PPC_STL r18, VCPU_GPR(r18)(r7) 135 PPC_STL r19, VCPU_GPR(r19)(r7) 136 PPC_STL r20, VCPU_GPR(r20)(r7) 137 PPC_STL r21, VCPU_GPR(r21)(r7) 138 PPC_STL r22, VCPU_GPR(r22)(r7) 139 PPC_STL r23, VCPU_GPR(r23)(r7) 140 PPC_STL r24, VCPU_GPR(r24)(r7) 141 PPC_STL r25, VCPU_GPR(r25)(r7) 142 PPC_STL r26, VCPU_GPR(r26)(r7) 143 PPC_STL r27, VCPU_GPR(r27)(r7) 144 PPC_STL r28, VCPU_GPR(r28)(r7) 145 PPC_STL r29, VCPU_GPR(r29)(r7) 146 PPC_STL r30, VCPU_GPR(r30)(r7) 147 PPC_STL r31, VCPU_GPR(r31)(r7) 148 149 /* Pass the exit number as 3rd argument to kvmppc_handle_exit */ 150 mr r5, r12 151 152 /* Restore r3 (kvm_run) and r4 (vcpu) */ 153 REST_2GPRS(3, r1) 154 bl FUNC(kvmppc_handle_exit) 155 156 /* If RESUME_GUEST, get back in the loop */ 157 cmpwi r3, RESUME_GUEST 158 beq kvm_loop_lightweight 159 160 cmpwi r3, RESUME_GUEST_NV 161 beq kvm_loop_heavyweight 162 163kvm_exit_loop: 164 165 PPC_LL r4, _LINK(r1) 166 mtlr r4 167 168 /* Restore non-volatile host registers (r14 - r31) */ 169 REST_NVGPRS(r1) 170 171 addi r1, r1, SWITCH_FRAME_SIZE 172 blr 173 174kvm_loop_heavyweight: 175 176 PPC_LL r4, _LINK(r1) 177 PPC_STL r4, (PPC_LR_STKOFF + SWITCH_FRAME_SIZE)(r1) 178 179 /* Load vcpu and cpu_run */ 180 REST_2GPRS(3, r1) 181 182 /* Load non-volatile guest state from the vcpu */ 183 VCPU_LOAD_NVGPRS(r4) 184 185 /* Jump back into the beginning of this function */ 186 b kvm_start_lightweight 187 188kvm_loop_lightweight: 189 190 /* We'll need the vcpu pointer */ 191 REST_GPR(4, r1) 192 193 /* Jump back into the beginning of this function */ 194 b kvm_start_lightweight 195